There’s a certain amount of fundamentals you need, after that point it’s quite easy to hop languages by just looking over the documentation of that language. If you skip those fundamentals, you end up with a bunch of knowledge but don’t realize you could do things way more effectively.

My recommendation: check out free resources for beginners and skip the atuff you already know thoroughly, focusing only on the stuff you don’t know.

source: I’m self-taught and had to go through this process myself.